September Is the Biggest Month of the Year for Snakebite Calls. Cats Survive Them at Roughly Twice the Rate Dogs Do.

Snakes are not more numerous in September. They are just awake at the same hours you are.

Through the hottest weeks of summer, pit vipers shift nocturnal — too hot to move in daylight. As mornings cool, they come back onto a daytime schedule, and they do it right as people start hiking again. Banner Poison and Drug Information Center logged 91 snakebite calls from Maricopa County over a year, and 20% of them landed in September alone — the single biggest month. [1]

The pet numbers

Roughly 150,000 dogs and cats are bitten by venomous snakes in the US each year. Up to 90% of those bites fall between April and October. [2][3]

Survival with prompt veterinary care runs around 80% in dogs. Cats do better: Australian research found cats roughly twice as likely as dogs to survive an encounter with a venomous snake there. [3]

That ordering surprises most people, since cats are smaller and the venom dose relative to body mass ought to work against them. The usual explanation is behavioral and anatomical. A cat tends to meet a snake with a paw, from a distance, and leave. A dog tends to meet it with its face. Dogs are most often bitten on the muzzle, lip, or lower limbs; cats on the forelimbs or muzzle. [2][3] A bite to the muzzle swells into an airway. A bite to a paw does not.

Copperheads, specifically

Copperheads range across a wide band from southern New England down to Texas, and they favor edges — where woods meet a yard, creek banks, leaf litter, woodpiles. [4] In spring and fall they are active in daylight; in summer heat they go nocturnal. [4] Which is to say: right now is their daytime season.

Two things about copperhead bites are worth carrying around:

• About 25% are dry bites, with no venom injected. [4]
• You cannot tell which kind you got for hours. [4]

The dry-bite figure is not a reason to wait at home, then. It is the reason a vet needs to be the one watching.

Copperhead venom is less potent than that of rattlesnakes, and the local effects dominate — severe swelling, pain, bruising, a fever. In a small dog or a cat, or in any bite to the face, that local swelling is itself the emergency. [4]

The first ten minutes

Do:

• Go to a vet immediately. Time to care correlates directly with outcome. [4]
• Take the collar off first if the bite is anywhere near the head or neck. Swelling arrives fast. [4]
• Keep the animal as calm and still as you can on the way. Movement moves venom. [3]
• Call ahead. Not every clinic keeps antivenom in the building, and finding that out on arrival costs the time that matters most.

Don't:

• No tourniquet, no ice, no cutting, no suction kit. These make things worse, not better. [1][3][4]
• No NSAIDs. Clotting is often already compromised, which is why vets reach for opioids such as methadone or hydromorphone for snakebite pain instead. [2]
• Don't go looking for the snake. A photo from a safe distance is useful; a second bite is not.

At the hospital, expect bloodwork including a clotting profile, IV fluids, pain control, and outlining of the swollen area with a marker so its progression can be tracked. Antivenom helps with pain and clotting abnormalities but cannot reverse tissue damage that has already happened, which is another argument for going early rather than waiting to see. [2]

Lowering the odds over the next six weeks

• Keep dogs leashed on trails, and out of tall grass, brush piles and rock stacks. [3]
• Walk the middle of the trail. The edges are where snakes rest. [1]
• Mow, and clear the leaf litter and woodpiles that hold rodents. The rodents are what bring the snakes. [3]
• Consider avoidance training if you live in rattlesnake country. [3]
• Give late-evening yard trips a porch light and a quick look, especially in warm southern states where activity runs later into the fall.

A word on the canine rattlesnake vaccine: it is conditionally licensed, the evidence behind it is thin, and no vet treats it as a substitute for an emergency visit. A vaccinated dog that gets bitten still needs the hospital.

The useful thing to do today

Find out now, before anything happens, which emergency hospital near you stocks antivenom. It is not every clinic, and it may not be the closest one. That is a two-minute phone call on a quiet Saturday, and a genuinely bad thing to be researching at nine at night with a swelling dog in the back seat.

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Sources

1. University of Arizona College of Medicine – Phoenix, "Snakebites Peak in September"
2. VETgirl, "Snake Envenomation: Eastern Copperhead"
3. Morris Animal Foundation, "Close Encounters of the Slithering Kind — Snake Bite on Dogs"
4. Pet Poison Helpline, "Copperhead Snakes: Envenomation Risk for Animals"